VEGA VEGAFLEX 86 4 … 20 mA_HART two-wire Rod and cable probe With SIL qualification - Manual (Page 36)

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6 Functional safety (SIL)
VEGAFLEX 86 • 4 … 20 mA/HART two-wire
44234-EN-130823
All parameters changed by the operator are automatically stored
temporarily so that they can be verified in the next step.
After setup, the modified parameters must be verified (confirm the
correctness of the parameters). To do this, you first have to enter the
PIN. Here the adjustment is locked automatically. Then you carry
out a comparison of two character strings. You must confirm that the
character strings are identical. This is used to check the character
presentation.
Then you confirm that the serial number of your instrument has been
carried over correctly. This is used to check device communication.
Then, all modified parameters that have to be confirmed are listed. Af-
ter this process is terminated, the safety function is again guaranteed.
Warning:
If the described process was not carried out completely or correctly
(e.g. interruption or voltage loss), the instrument remains in the
released and hence unsafe status.
Warning:
In case of a reset to basic settings, all safety-relevant parameters will
also be reset to default. Therefore all safety-relevant parameters must
be checked or readjusted.
6.5 Setup process
Adjustment process
A parameter change with SIL qualified instruments must always be
carried out as follows.
•
Release adjustment
•
Change parameter
•
Lock adjustment and verify modified parameters
The setup must be carried out according to an exactly specified pat-
tern.
Generally the instrument is in safe operating condition before the
adjustment is released.
Each parameter change requires the release of the instrument
through a PIN (see chapter "Setup steps - Lock adjustment").
In delivery status, the PIN is 0000.
Set up the VEGAFLEX 86 according to the specification in this oper-
ating instructions and the Safety Manual.
When locking the adjustment, the instrument checks the data of the
measurement loop and decides on the basis of the evaluation results
if a function test is required.
Function test not required
If the parameter check was successful, the adjustment is locked auto-
matically and the instrument is again in safe operating condition.
Change parameter
Verify parameters/Lock
adjustment
Incomplete process
Instrument reset
Start: Safe operating
condition
Release adjustment
Change parameter
Setup - Function test